Earlier quoted context omitted.
Many of those crimes are drug crimes, which are only a crime because we've chosen to make them so. It's not all that hard to change a law to make a certain group of people whose habits you dislike criminals.
There are definitely elements of this involved; I just challenge the idea that this is the whole story. If you're comparing the US to a country where drugs are legal, of course the US crime and incarceration rates are going to be higher on account of that fact. That's not the comparison being offered, though.
In canada, people caught with kilos of coke get house arrest.
There was a guy caught with 500kg of MDMA in his backyard kitchen and he got house arrest.
People don't go to jail for drug crimes - they usually get community service or house arrest.
Certainly for possession NO ONE goes to jail in Canada, but I've read that in the US people with a gram of weed have been sent to jail. WTF?
Or for that matter, two hits of crack, and you get like 10 years or something ridiculous.
In canada it's almost impossible to actually serve jailtime for a possession charge, and even trafficking charges are often not met with incarceration but rather conditions.